Báo cáo lâm nghiệp: " Viscoelastic behaviour of green wood across the grain Part I Thermally activated creep tests up to 120 °C" ppsx
Báo cáo lâm nghiệp: " Viscoelastic behaviour of green wood across the grain. Part I. Thermally activated creep tests up to 120 °C" ppsx
... which may be infinite or negative…These problems are intrinsically tied to creep tests, for which the whole history is assumed to be due to the thermal activation of the viscoelastic behaviour. ... Sci. 62 (2005) 707–716© INRA, EDP Sciences, 2005DOI: 10.1051/forest:2005067Original article Viscoelastic behaviour of green wood across the grain. Part I. Thermally activated creep tests up ... available for elastic properties of wood. In case of viscoelasticity of wood it is not obvious to evaluate the shear strength effect, especially during the thermal activation.Indeed the transition...
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Báo cáo lâm nghiệp: "Viscoelastic behaviour of green wood across the grain. Part II. A temperature dependent constitutive model defined by inverse method" pot
... andused simultaneously to fit the parameters of the constitutive model. Inthis possibility lies the main innovation of the inverse method pro-posed here. This feature is the key element of the identification ... identification pro-cedure and guarantees the quality of the fitted parameters and the widerange of validity of the resulting constitutive model.2.2. Simulation of the experimental tests The creep ... that the inverse method algorithm should be able to deal with multidimen-sional minimisation. In addition, Kelvin’s elements with thermal acti-vation involve dramatic non-linear behaviour. The...
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Báo cáo lâm nghiệp: "Historical development of floodplain forests in the Upper Moravian Vale (Vrapač National Nature Reserve, Czech Republic)" pot
... among the individual river arms at the Řimice dam as well as the obligations of the millers to maintain the dam were stated in writing in the so-called Contract of Řimice drafted in 1474 ... erosion of the river bed in the area of the artificially straightened part of the Morava River above Litovel is probably the cause of a gradual decease in some of the intermittent river arms (the ... originate in the main stream of the Morava River in the area of Vrapač. e recess of the Morava River into its own bed by means of the head erosion causes the upstream parts of the intermittent...
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Báo cáo lâm nghiệp: "Habitat distribution of dipterocarp species in the Leyte Cordillera: an indicator for species – site suitability in local reforestation programs" ppt
... Leyte Cordillera on the island of Leyte, Philippines, to document the occurrence andhabitat distribution of dipterocarp species. A total of 18 species belonging to the six Philippine dipterocarp ... identified at Mt. Pangasugan and its vicinities(Tab. II). The 18 species belong to the six Philippine diptero-carp genera and make up 28% of the 65 dipterocarp species [2]known from the Philippines. ... Therefore, if native speciesare to be promoted, the only practical way to reduce the risks of failure due to the selection of unsuited habitats is to stick to observations on the natural occurrence of...
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Báo cáo lâm nghiệp: " Flight activity of Anthribus nebulosus Forster, 1770 (Coleoptera: Anthribidae) and notes to its life history" potx
... Jeseník Hills, the flight activity started at the beginning of May and ended in mid-June with the peak at the end of May and beginning of June in 2005 (Fig. 2). In 2006, the flight activity started ... with masses of A. nebulosus very intensively. In five localities with Malaise traps in the Nízký Jeseník Hills, the flight activity started at the beginning of May and ended in mid-June with the ... at the end of May and beginning of June in 2005. In 2006, the flight activity started later in mid-May and lasted to the beginning of July but was interrupted by cold and rainy weather. At higher...
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Báo cáo lâm nghiệp: "Spatial distribution of four spruce bark beetles in north-western Slovakia" pps
... suggesting highly prevalence of IT in trees mortality in this region. Distribution of IA is limited to high elevations around Slovak-Polish border in the western part of study territory (eleva-tion ... having high intensity of tree infes-tation mainly along the main valley in the region. Lower elevations occurring in the southern part of region were often infested by I. duplicatus with I. typographus ... base of the crown; III, just below the base of the crown; IV, in the middle of the crown; V, in the upper part of the crown. e infestation density of five bark beetles, expressed as the number...
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Báo cáo lâm nghiệp: "Initial evaluation of half-sib progenies of Norway spruce using the best line" potx
... Maximum Likelihood (REML) followed by the Best Linear Unbiased Prediction (BLUP) is the most efficient method for the identification of individuals, which enables to achieve maximum genetic gain in ... due to Mendelian sampling of alleles, which is a source of significant additive variance (F, M 1996). Due to this build -up of genetic variance, it is possible to find superior progeny ... observations in Y. Second, they are unbiased in the sense that the average value of the estimate (with respect to the distribution of Y) is equal to the expected value of the quantities being...
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Báo cáo lâm nghiệp: "Complex study of foliage nutrient status in ash fertilized Scots pine stands in Lithuani" pptx
... other nutrients begin to limit growth. us, the general aim of forest fertilization is to improve the growth of a tree stand by adding the complex of nutrients, the lack of which is limiting ... saturates the soil with additional amounts of various nutrients. Like usual fertilizers, this application could either cause the imbalance of elements in the soils or improve the nutrient status ... best initial tool for the response evaluation was the significance analyses of the changes in the nutrient composition in the soil and nee-dles. e comparison of nutrient concentrations with...
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Báo cáo lâm nghiệp: "Value production of poplar clones'''' ppt
... With the highest site indexes it is at the age of 25 to 30 years, for intermediate site indexes it is expected immediately after the limit of 35 years but for the lowest site indexes it is ... in the forest up to the deliveries of assortments for their industrial processing. It is obvious from the overview that the primary production of raw timber assortments is decisive in the ... while class II has slightly lower requirements for the quality of wood than class I. Class I requires a minimum log diameter of 40 cm and class II requires 20 cm. Quality classes IIIA, IIIB...
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Báo cáo lâm nghiệp: " Production potential of Douglas fir at mesotrophic sites of Křtiny Training Forest Enterprise" ppsx
... mainly in the position of an individual admixture. In 485 stand parts (73.5%), Douglas fir is registered in an interval from 1 to 10% (its reduced area is 51.16 ha). In total in 106 stand parts ... assessing production capacities of introduced species it is necessary to mention at the first place data on their growth and production at the original habitat. Data on their production po-tential, ... within research programs of Ministry of Agriculture of the Czech Republic, the competition of tenders was announced, among others, in the thematic field Using allochthonous species in multi-functional...
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